<!DOCTYPE html>
<html lang="zh">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 600px;
            height: 269px;
            margin: 100px auto;
            
        }
        img {
            width: 500px;
            filter: blur(10px);
            transition: all 4s;
            border-radius: 30px;
        }
        div:hover img {
            filter: blur(0);
        }
    </style>
</head>

<body>
    <div class="">
        <img src="images/haha1.jpg" alt="">
    </div>
</body>

</html>